MCNP fatal error with geometry definition

  • Thread starter LeeGru
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LeeGru
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TL;DR
What does this error mean? How to solve it?
Screenshot of an MCNP run output window showing repeated lines reading 'fatal error. illegal pattern as first entry on cell or surface card.' Garbled text fragments appear above, including 'ixi=inp o=oved ru=rved wwout=eved wwone=nrved wssa=wsved'.
 
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Discussion

Hi,
like above please give input file and also computer specs. Have you ran files before successfully?
 

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